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System and method for magnetic resonance imaging of 3-dimensional heart wall motion with spatial modulation of magnetization
System and method for magnetic resonance imaging of 3-dimensional heart wall motion with spatial modulation of magnetization
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机译:具有磁化空间调制的三维心脏壁运动磁共振成像的系统和方法
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摘要
Spatial Modulation of Magnetization (SPAMM) with two sets of tagging planes orthogonal to the image plane is used in accordance with known techniques to image two-dimensional heart wall motion with MRI. However, such techniques are modified in accordance with the invention to permit direct assessment of three-dimensional heart wall motion from two- dimensional images using a three-dimensional SPAMM technique and a phase shift SPAMM technique. The three-dimensional SPAMM technique uses a third set of tagging planes oblique to the image plane to separate within-plane motion from through-plane motion. In accordance with the 3-dimensional SPAMM technique, the displacement of the oblique magnetization lines relative to the displacement of the spatial modulation pattern in the imaging plane during a preimaging time interval is indicative of the displacement of a body portion such as a patient's heart wall through the imaging plane during the preimaging time interval. Preferably, the oblique angle is 45° so that the amount of stripe displacement is equal to the amount of through-plane-motion. On the other hand, the phase- shift SPAMM technique encodes through-plane velocity as a corresponding phase shift. An integral may then be taken of the resulting phase- sensitized images in order to determine the through-plane displacement corresponding to the phase shift. Both techniques in accordance with the invention allow three-dimensional images of internal body tissues such as the heart wall to be imaged with minimal image acquisition and interpolation time.
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